CN106447897A - Method and apparatus for detecting magnetic characteristics of paper note - Google Patents
Method and apparatus for detecting magnetic characteristics of paper note Download PDFInfo
- Publication number
- CN106447897A CN106447897A CN201610670807.5A CN201610670807A CN106447897A CN 106447897 A CN106447897 A CN 106447897A CN 201610670807 A CN201610670807 A CN 201610670807A CN 106447897 A CN106447897 A CN 106447897A
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- Prior art keywords
- bank note
- magnetic
- threshold value
- safety line
- amplitude
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Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D2207/00—Paper-money testing devices
Abstract
The invention discloses a method and apparatus for detecting the magnetic characteristics of a paper note and relates to the technical field of computer data processing technology. The method includes the following steps: based on the surface characteristics of the paper note, identifying the side of the paper note; acquiring the magnetic amplitude of the safety line of the paper note, comparing the magnetic amplitude with the magnetic detection threshold value, and based on the result of the comparison, determining the genuineness of the paper note. According to the invention, the method uses a dynamic threshold value to detect and determine the magnetism of the paper note, which eliminates the detection errors caused by fixed background threshold value detection and increases the accuracy of detecting the paper note.
Description
Technical field
The present invention relates to microcomputer data processing field, particularly relate to a kind of method detecting bank note magnetic characteristic and
Device.
Background technology
With economic fast development, the velocity of liquid assets of bank note is increasingly faster, in daily life, is inevitably present
The circulation of counterfeit note, and, the forgery means of bank note are more and more brilliant, and people are difficult to differentiate.Gold has been upset in the circulation of counterfeit money
Melting order, that gives the country and people brings serious economic loss.
At present, in the detection means of bank note, bank note magnetic is detected mainly by detecting the magnetic of bank note, root
It is analyzed according to the magnetic of detection, it is judged that the true and false of bank note.
But, when bank note magnetic characteristic is judged, if using fixing background threshold, it is easy to make mistakes, produce
The phenomenon of raw erroneous judgement.
Content of the invention
In view of this, the purpose of the present invention is to propose to a kind of method and device detecting bank note magnetic characteristic, to solve to make
When carrying out magnetic detection with fixed threshold, it is impossible to enough problems accurately detecting forge or true or paper money.
For achieving the above object, the present invention adopts the following technical scheme that：
First aspect, the invention provides a kind of method detecting bank note magnetic characteristic, including：
Coin region feature according to bank note, identify bank note towards；
According to the bank note identifying towards the magnetic detection threshold value of setting bank note；
Obtain the magnetic amplitude of bank note safety line, magnetic amplitude is compared with magnetic detection threshold value, according to comparing knot
Really, it is judged that forge or true or paper money.
In the above-mentioned methods, it is preferred that identify that bank note, towards before, also includes：
Gather the image of bank note, extract the coin region feature of bank note, utilize coin region feature training neutral net, set up nerve net
Network identifier.
In the above-mentioned methods, it is preferred that according to identify bank note towards, set bank note magnetic detection threshold value, including：
When the bank note coin face identifying is front, set magnetic detection threshold value as the first fixed threshold；When the bank note identifying
When coin face is reverse side, the first fixed threshold is deducted a preset difference value and obtains the second fixed threshold, set magnetic detection threshold value
It is the second fixed threshold.
In the above-mentioned methods, it is preferred that obtain bank note safety line magnetic amplitude, including：
The magnetic characteristic curve of acquisition bank note safety line, and detect the magnetic characteristic curve of described bank note safety line, obtain
The magnetic amplitude of bank note safety line.
Second aspect, the invention provides a kind of device detecting bank note magnetic characteristic, including：
Module for recognizing paper money, for according to the coin region feature of bank note, identify bank note towards；
Threshold value setting module, for the bank note according to identification towards the magnetic detection threshold value of setting bank note；
Magnetic detection module, for obtaining the magnetic amplitude of bank note safety line；
Authenticity module, for comparing magnetic amplitude with magnetic detection threshold value, according to comparative result, it is judged that paper
The coin true and false.
In said apparatus, it is preferred that said apparatus also includes：
Features training module, is used for identifying that bank note, towards before, extracts the coin region feature of bank note, utilizes coin region feature to train
Neutral net, sets up neural network recognizer.
In said apparatus, it is preferred that threshold value setting module, specifically for：
When the bank note coin face identifying is front, set magnetic detection threshold value as the first fixed threshold；When the bank note identifying
When coin face is reverse side, the first fixed threshold is deducted a preset difference value and obtains the second fixed threshold, set magnetic detection threshold value
It is the second fixed threshold.
In said apparatus, it is preferred that magnetic detection module, specifically for：
The magnetic characteristic curve of acquisition bank note safety line, and detect the magnetic characteristic curve of described bank note safety line, obtain
The magnetic amplitude of bank note safety line.
The invention has the beneficial effects as follows：The method and device of the detection bank note magnetic characteristic that the present invention provides, according to identification
To the difference of bank note towards arranging magnetic detection threshold value, carried out the detection of bank note magnetic by using dynamic threshold and sentence
Disconnected, it can be avoided that the detection error that fixed background threshold test causes, improve the degree of accuracy of paper currency detection.
Brief description
Below by describing the exemplary embodiment of the present invention in detail by referring to accompanying drawing, make those of ordinary skill in the art
Become apparent from the above-mentioned and other feature and advantage of the present invention, in accompanying drawing：
Fig. 1 is the schematic flow sheet of a kind of method detecting bank note magnetic characteristic that the embodiment of the present invention one provides；
Fig. 2 is the schematic flow sheet of a kind of method detecting bank note magnetic characteristic that the embodiment of the present invention two provides；
Fig. 3 is the safety line amplitude characteristic schematic diagram of 100 yuan notes that the embodiment of the present invention two provides；
Fig. 4 (a) is the front schematic view of 100 yuan notes that the embodiment of the present invention two provides；
Fig. 4 (b) is the reverse side schematic diagram of 100 yuan notes that the embodiment of the present invention two provides；
Fig. 5 is the structured flowchart of a kind of device detecting bank note magnetic characteristic that the embodiment of the present invention three provides.
Detailed description of the invention
Below in conjunction with the accompanying drawings and further illustrate technical scheme by detailed description of the invention.May be appreciated
It is that specific embodiment described herein is used only for explaining the present invention, rather than limitation of the invention.Further need exist for explanation
, for the ease of describing, accompanying drawing illustrate only part related to the present invention rather than entire infrastructure.
Embodiment one
Fig. 1 is the schematic flow sheet that the embodiment of the present invention one provides a kind of method detecting bank note magnetic characteristic.The party
Method is applicable to judge the situation of forge or true or paper money according to detection bank note magnetic characteristic, and the method can be by detection bank note magnetic characteristic
Device performs.The device of detection bank note magnetic characteristic can be realized by the mode of software and/or hardware, and typically can be integrated
In needing in the equipment that bank note is identified, the self-service automatic teller machine of such as ATM, cash inspecting machine etc..As it is shown in figure 1, the method bag
Include：
Step 110, the coin region feature according to bank note, identify bank note towards.
By carrying out IMAQ to bank note to be detected, obtain the coin region feature of bank note, coin region feature is input to nerve
Network recognizer is identified, it is thus achieved that bank note Information.
Step 120, according to identify bank note towards, set bank note magnetic detection threshold value.
According to the Information of the bank note identifying, set the magnetic detection threshold value of corresponding bank note.Coin face due to bank note
Difference, during detection, safety line is different from the distance of magnetic sensor, will directly influence the knot of magnetic sensor detection
Really, so can be according to towards arranging different magnetic detection threshold values.Preferably, when the front in coin face contacts with magnetic sensor
When, currency type according to bank note sets corresponding fixed threshold, when the reverse side in this coin face contacts with magnetic sensor, sensor with
Differing the thickness of a bank note between safety line, now, the amplitude that sensor is detected can be affected by banknote thickness, institute
To deduct a difference on the basis of this fixed threshold and to obtain a new threshold value, this threshold value is carried out as detection threshold value
Detection.
The magnetic amplitude obtaining and magnetic detection threshold value are compared by step 130, the magnetic amplitude obtaining bank note safety line
Relatively, according to comparative result, it is judged that forge or true or paper money.
The bank note safety line magnetic amplitude of acquisition and magnetic detection threshold value are compared, if permitted in magnetic detection threshold value
In the range of being permitted, then judge that bank note is genuine note；Otherwise, it is judged that bank note is counterfeit money.
A kind of method detecting bank note magnetic characteristic that the embodiment of the present invention one provides, according to bank note towards arranging not
With judgment threshold, reduce the impact on magnetic amplitude of the thickness of bank note itself；By reducing the thickness of bank note itself to magnetic
The magnetic characteristic to bank note for the interference that property amplitude size causes detects, and improves bank note magnetic discrimination.
Embodiment two
Fig. 2 is the schematic flow sheet of a kind of method detecting bank note magnetic characteristic that the embodiment of the present invention two provides.This reality
Execute example to be optimized based on above-described embodiment, in the present embodiment, identifying that bank note, towards before, also includes：Gather paper
The image of coin, extracts the coin region feature of bank note, utilizes coin region feature training neutral net, sets up neural network recognizer.
Accordingly, the method for the present embodiment specifically includes：
Step 210, the image gathering bank note, extract the coin region feature of bank note, utilizes coin region feature training neutral net, builds
Vertical neural network recognizer.
The banknote image gathering can be any one or more in infrared image, visible images and ultraviolet image,
Gather the image of bank note respectively under different intensities of illumination, it is thus achieved that substantial amounts of sample image.
According to concrete application, gather the positive inverse video of genuine note of respective type, can be RMB or other have magnetic stripe
Bank note.The image of collection is pre-processed, by detection bank note edge, removes background image, it is thus achieved that banknote image；To obtain
The banknote image obtaining carries out feature extraction, using the feature of extraction as the sample set of training neutral net, carries out neutral net
Training, through the training of great amount of samples, obtain neural network recognizer Mathematical Modeling, for identify bank note towards.
Step 220, the coin region feature according to bank note, identify bank note towards.
Gather the image of bank note to be detected, carry out rim detection to image, remove bank note background image, it is thus achieved that bank note figure
Picture, extracts the coin region feature of bank note, is input in neural network recognizer, it is thus achieved that the coin surface information of bank note, including：The face of bank note
To the species with bank note.
Step 230, according to identify bank note towards, set bank note magnetic detection threshold value.
More preferably, when the bank note coin face identifying is front, described magnetic detection threshold value is set as the first fixed threshold；When
When the bank note coin face identifying is reverse side, described first fixed threshold is deducted a preset difference value and obtains the second fixed threshold, if
Fixed described magnetic detection threshold value is the second fixed threshold.
Bank note is different from magnetic sensor contact surface, and the magnetic amplitude of the safety line collecting is also different, and safety line is from magnetic
Property sensor is nearer, and amplitude is bigger；Safety line from magnetic sensor more away from, amplitude is less.Illustrate as a example by Fig. 3.
Fig. 3 is the safety line amplitude characteristic schematic diagram of 100 yuan notes that the embodiment of the present invention provides；Eminence in the right figure of Fig. 3
Peak value size about 3500, be amplitude when being close to magnetic sensor for the bank note safety line；The amplitude base of eminence in the left figure of Fig. 3
This is about 3000, and now, bank note safety line is not close to sensor.Fig. 4 (a) is the front of bank note, if this face when crossing paper money
When being close to sensor, bank note magnetic characteristic amplitude is bigger；If the reverse side of bank note is close to sensor in Fig. 4 (b), safety line
With the thickness having differed a bank note in the middle of sensor, now the amplitude of safety line may weaken.
If going detection according to the background threshold of regulation, the feature detection in Fig. 3 may be made mistakes, and therefore, consider
The distance of safety line and magnetic sensor, by identify bank note towards determining the distance of safety line magnetic sensor, according to knowledge
Other bank note is towards the magnetic detection threshold value of setting bank note.
The magnetic amplitude obtaining and magnetic detection threshold value are compared by step 240, the magnetic amplitude obtaining bank note safety line
Relatively, according to comparative result, it is judged that forge or true or paper money.
Preferably, the magnetic amplitude of bank note safety line is obtained, including：Obtain the magnetic characteristic curve of bank note safety line, and
Detect the magnetic characteristic curve of described bank note safety line, obtain the magnetic amplitude of bank note safety line.
According to bank note towards, it is thus achieved that corresponding magnetic detection threshold value；Obtain according to bank note safety line magnetic indicatrix
The magnetic amplitude of bank note safety line；The magnetic amplitude obtaining and magnetic detection threshold value are compared, according to comparative result, it is judged that
The true and false of bank note.
A kind of method detecting bank note magnetic characteristic that the embodiment of the present invention provides, the first figure according to the genuine note gathering
Picture, extracts the feature of image as sample set, training neutral net, neural network recognizer；Utilize neural network recognizer pair
Banknote image feature to be detected is identified, it is thus achieved that the Information of bank note and currency type information；Information according to bank note
The magnetic detection threshold value of bank note is set with currency type information；Magnetic according to the safety line to bank note for the magnetic detection threshold value setting is special
Levy and detect, judge the true and false of bank note according to the result of detection, finally realize the process of paper money recognition.
Embodiment three
Fig. 5 is the structured flowchart of a kind of device detecting bank note magnetic characteristic that the embodiment of the present invention three provides.Such as Fig. 5 institute
Showing, this device includes：Module for recognizing paper money the 510th, threshold value setting module the 520th, magnetic detection module 530 and authenticity module
540.This device can be applicable to cash inspecting machine, in ATM automatic teller machine.
Module for recognizing paper money 510, for according to the coin region feature of bank note, identify bank note towards；Threshold value setting module 520,
For the bank note according to identification towards the magnetic detection threshold value of setting bank note；Magnetic detection module 530, is used for obtaining bank note peace
The magnetic amplitude of all fronts；Authenticity module 540, for comparing the magnetic amplitude obtaining and magnetic detection threshold value, root
According to comparative result, it is judged that forge or true or paper money.
Detection bank note magnetic characteristic device also includes：Features training module, is used for identifying that bank note, towards before, extracts bank note
Coin region feature, utilize coin region feature training neutral net, set up neural network recognizer.
Further, threshold value setting module 520, specifically for：
When the bank note coin face identifying is front, set magnetic detection threshold value as the first fixed threshold；When the bank note identifying
When coin face is reverse side, the first fixed threshold is deducted a preset difference value and obtains the second fixed threshold, set magnetic detection threshold value
It is the second fixed threshold.
Further, magnetic detection module 530, specifically for：
The magnetic characteristic curve of acquisition bank note safety line, and detect the magnetic characteristic curve of described bank note safety line, obtain
The magnetic amplitude of bank note safety line.
Exemplarily, if bank note forward contacts with magnetic sensor, then fixed threshold Theshold is used to detect
Bank note safety line amplitude Characteristics；If bank note reverse side contacts with magnetic sensor, then between magnetic sensor and safety line
Differ the thickness of a bank note, fixed threshold Theshold now can not be used to detect, needed at fixed threshold base
Deduct difference Diff on plinth and obtain new threshold value Theshold1, then use new threshold value Theshold1 to examine
Survey.
Present embodiments provide a kind of device detecting bank note magnetic characteristic, the coin region feature to bank note for the features training module
Extract, utilize characteristic set training neutral net, set up neural network recognizer Mathematical Modeling, be module for recognizing paper money
510 offer identifiers；Module for recognizing paper money 510 utilizes Information and the currency type information of neural network recognizer identification bank note,
The result of identification is sent to threshold value setting module 520；The paper that threshold value setting module 520 sends according to module for recognizing paper money 510
Coin information determines paper currency detection threshold value, and the detection threshold value of bank note is sent to authenticity module 540；Utilize magnetic detection mould
Block 530, obtains the safety line magnetic characteristic curve of bank note, and detect the magnetic characteristic curve of bank note safety line, obtain bank note peace
The magnetic amplitude of all fronts, and it is sent to authenticity module 540；Authenticity module 540 sends according to threshold value setting module 520
Paper currency detection threshold value, the bank note safety line magnetic amplitude sending magnetic detection module 530 compares, when magnetic amplitude is in inspection
When in survey threshold range, it is judged that bank note is genuine note, otherwise, it is judged that be counterfeit money.By detection bank note towards arranging different inspections
Survey threshold value, the impact on magnetic amplitude for the thickness of reduction bank note itself, improve the magnetic characteristic accuracy of detection bank note, it is to avoid
The impact on testing result for the banknote thickness.
The present embodiment provide a kind of device detecting bank note magnetic characteristic, with any embodiment of the present invention provided one
The method planting detection bank note magnetic characteristic belongs to same inventive concept, can perform the detection paper that any embodiment of the present invention is provided
The method of coin magnetic characteristic, possesses corresponding function and beneficial effect.The ins and outs of not detailed in the present embodiment description, can
See the method for the detection bank note magnetic characteristic that any embodiment of the present invention provides.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious change,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although by above example, the present invention is carried out
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other Equivalent embodiments more can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (8)
1. the method detecting bank note magnetic characteristic, it is characterised in that include：
Coin region feature according to bank note, identify bank note towards；
According to the described bank note identifying towards the magnetic detection threshold value of setting bank note；
Obtain bank note safety line magnetic amplitude, described magnetic amplitude is compared with described magnetic detection threshold value, according to than
Relatively result, it is judged that forge or true or paper money.
2. method according to claim 1, it is characterised in that described identification bank note, towards before, also includes：
Gather the image of bank note, extract the coin region feature of bank note, utilize described coin region feature training neutral net, set up nerve net
Network identifier.
3. method according to claim 1, it is characterised in that the described described bank note according to identification is towards setting bank note
Magnetic detection threshold value, including：
When the bank note coin face identifying is front, set described magnetic detection threshold value as the first fixed threshold；When the bank note identifying
When coin face is reverse side, described first fixed threshold is deducted a preset difference value and obtains the second fixed threshold, set described magnetic
Detection threshold value is the second fixed threshold.
4. method according to claim 1, it is characterised in that the magnetic amplitude of described acquisition bank note safety line, including：
The magnetic characteristic curve of acquisition bank note safety line, and detect the magnetic characteristic curve of described bank note safety line, obtain bank note
The magnetic amplitude of safety line.
5. the device detecting bank note magnetic characteristic, it is characterised in that include：
Module for recognizing paper money, for according to the coin region feature of bank note, identify bank note towards；
Threshold value setting module, for the described bank note according to identification towards the magnetic detection threshold value of setting bank note；
Magnetic detection module, for obtaining the magnetic amplitude of bank note safety line；
Authenticity module, for comparing described magnetic amplitude with described magnetic detection threshold value, according to comparative result, sentences
Disconnected forge or true or paper money.
6. device according to claim 5, it is characterised in that also include：
Features training module, is used for identifying that bank note, towards before, extracts the coin region feature of bank note, utilizes described coin region feature to train
Neutral net, sets up neural network recognizer.
7. device according to claim 5, it is characterised in that described threshold value setting module, specifically for：
When the bank note coin face identifying is front, set described magnetic detection threshold value as the first fixed threshold；When the bank note identifying
When coin face is reverse side, described first fixed threshold is deducted a preset difference value and obtains the second fixed threshold, set described magnetic
Detection threshold value is the second fixed threshold.
8. device according to claim 5, it is characterised in that described magnetic detection module, specifically for：
The magnetic characteristic curve of acquisition bank note safety line, and detect the magnetic characteristic curve of described bank note safety line, obtain bank note
The magnetic amplitude of safety line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610670807.5A CN106447897A (en) | 2016-08-15 | 2016-08-15 | Method and apparatus for detecting magnetic characteristics of paper note |
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| CN201610670807.5A CN106447897A (en) | 2016-08-15 | 2016-08-15 | Method and apparatus for detecting magnetic characteristics of paper note |
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| CN110599672A (en) * | 2019-08-30 | 2019-12-20 | 深圳怡化电脑股份有限公司 | Cash-sticking detection method and device for financial equipment, terminal equipment and storage medium |
| CN111341006A (en) * | 2020-02-28 | 2020-06-26 | 深圳怡化电脑股份有限公司 | Hidden magnetic stripe paper money identification method, system, server and storage medium |
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